Number of characters in a string - MIPS

[Jeph_1]

Hello, I am trying to count the number of characters in a string $a0 that return a 1 when passed to the function, otherwise return 0. Heres what I did: I dont have the correct answer __ output format must be 3, I have 11

  .text
        .globl __start
__start:                # execution starts here  */


        la $a0,ans
        li $v0,4        # print out string
        syscall

        la $a0,str
        jal strchk      # call strchk function

        move $a0,$v0
        li $v0,1        # print out returned value
        syscall

        la $a0,endl     # system call to print
        li $v0,4        # out a newline
        syscall

        li $v0,10
        syscall         # au revoir...

#
# checkch is a function which takes a character
# in a0,  and returns either 0 or 1 in v0,
# depending on the result of some test.
# Do not rely of the particular operation performed
# by checkch or the registers used.
# These will be different in other mipsmark cases.
#

checkch:
        li $v0,0
        beq  $a0,'a',yes
        beq  $a0,'e',yes
        beq  $a0,'i',yes
        beq  $a0,'o',yes
        beq  $a0,'u',yes
        jr $ra
yes:    li $v0,1
        jr $ra

#/* Any changes above this line will be discarded by
# mipsmark. Put your answer between dashed lines. */
#/*-------------- start cut ----------------------- */

strchk:

        sub $sp, $sp, 16                # adjusting a stack pointer to store an address of string and return an address
        sw $a0, 0($sp)
        sw $s0, 4($sp)
        sw $s1, 8($sp)
        sw $ra, 12($sp)

        li $s0, 0                       # for total vowel count
        move $s1, $a0                   # move address in $a0


loop:

        lb $a0, 0($s1)                  # load char in $a0
        beqz $a0, done                  # if null char, branch to done
        jal checkch                     # jump to checkch
#       add  $s0, $s0, $v0              # increment an address offset
        addi $s1, $s1, 1                # add vowel counter
#       j loop
        bne $a0, $v0, jump

jump:

        add $s0, $s0, 1
        j loop

done:

        move $v0, $s0                   # use $v0 for result
        lw  $a0, 0($sp)
        lw $s0, 4($sp)
        lw $s0, 8($sp)

        add $a0, $0, $s1

        lw $ra, 12($sp)                 # retrieve a return address
        lw $a0, 0($sp)                  # retrieve value in $a0
        add $sp, $sp, 16                # adjust stack pointer
        jr $ra                          # jump to calling




#/*
        j __start       #nasty loop if mips program not exited */
#/*--------------  end cut  -----------------------
# Any changes below this line will be discarded by
# mipsmark. Put your answer between dashed lines.

#################################################
#                                               #
#               data segment                    #
#                                               #
#################################################

        .data                   #*/
str:    .asciiz "aei0956xyz\n"
ans:    .asciiz "number of characters that pass test = "
endl:   .asciiz "\n"
#

[rproffitt]

This one is simple as checkch tells us you only consider aeiou to be characters. If you want to include all characters you don't need to call checkch at all.

[rproffitt]

You'll need to tell me what you tried.

As an example make any character a match I could break checkch() like this:

# checkch is a function which just says yes.

checkch:
yes:    li $v0,1
        jr $ra

[rproffitt]

Did you figure it out? I see your comments in the emails that DANIWEB sends out.